Pd-Catalyzed Asymmetric Cα-Allenylic Alkylation/1,3-Dipolar Cycloaddition of Nitrones: Temperature-Controlled Chemodivergent Synthesis of Chiral Bridged N -Heterocycles and Allenyl Oxindoles

-heterocycles bearing spiro-oxindole motifs with excellent ee and moderate to good dr. The reaction proceeds through the allenylic alkylation at the sterically hindered Cα site of isatin-derived nitrones, followed by intramolecular 1,3-dipolar cycloaddition. Notably, by adjusting the reaction temperature, the Cα-selective allenylic alkylation is achieved independently, offering a distinctive strategy for accessing chiral allenyl oxindoles.